Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number: R09 Display screen:No NFC Support:No Activity Tracked:Activity Tracker,Steps Tracker,Distance Tracker,Calorie Tracker Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor,Body Temperature Monitor,Stress Monitor Item Weight:About 3.5g Case Material:STEEL Certification:ce,FCC Brand Name: Battery Capacity(mAh):15mAh (7#~9#), 18mAh(10#~13#) Smart Ring No.1 in sales on AliExpress, and is far ahead. Note: 1. For best performance and accuracy, we recommend wearing the Ring on your index finger. If you prefer other fingers, the middle and ring fingers are also OK. Avoid using fingers that are narrower than the knuckles at the base. 2. The size of rings may not be completely in line with universal standards. Please measure your finger circumference before purchasing and make sure it fits comfortably, then choose the appropriate size. 3. How to start: Use the included charging cable or charging case to charge Ring. The heart rate light will light up to indicate successful startup. Then you can use the APP Qring to connect the Ring. 4. Some models have a protective film on the charging port. Please remove the protective film before charging. R09 - Lighter and Comfortable Wear The R09 Smart Ring is a sleek and stylish wearable that combines health monitoring with modern design. Featuring a unique concave design, the R09 is now 20% lighter, making it even more comfortable for all-day wear. This feather-light, durable smart ring provides 24/7 heart rate tracking, skin temperature monitoring, sleep monitoring, and activity tracking to help you stay on top of your health. Crafted with a titanium steel shell and advanced low-temperature potting technology, it offers a 5ATM & IP68 water resistance rating, ensuring wearability and resilience. The R09 delivers the ideal blend of functionality, fashion, and comfort. official store Authentic smart watch are engineered and manufactured with high-quality materials, and they're always quality-tested before they leave our factory. Since counterfeit or fake devices are not built or tested to these standards, they might perform poorly or malfunction. So, we recommend buying devices sold only by our official store. Brand Story was established in 2012. Slogan: Your first smart watch. Young and simple, but never naive. Mission: Provide cost-effective smart electronics.